Amount of light truly necessary
So I have a project in mind that would involve turning our spare bedroom into a growing space. I think I have everything pretty well figure our except for the lighting. I have been all over and have read any number of different articles all pointing to different amounts of light necessary for growing. I would like to build half of an A frame against the wall and need to figure out how much light i need. Some people state what you need in watts, some in lumens, some in lux. I was hoping to get away without jumping my electric bill up $40/month. The A frame will be 7' wide x 5.5' tall. This leaves the angles plane at an area of about 45 square feet. I am reading that the plants should receive around 2000 lumens per square foot. For this setup then I would need about 1000W of HID if I did my math right. That would cost around $40 a month for me. I have looked into fluorescents but they seem to be less efficient than the HIDs. Can someone please give me a second opinion?